A smart-alec remark made by one who is very witty. Used to tell the other person to dumb down the vocabulary. Usually precedes a sentence containing difficult vocabulary.

Mrs. Teacher: In Biology today, we will be learning about transport within a cell membrane, where different types include active and passive transport. Diffusion...... osmosis....... phospholipid bilayer.....
Student: English please!
Mrs. Teacher: We're learning how cells move stuff around.